RPG (Report Program Generator) is a programming language that originated
as a report-building program used in DEC and IBM minicomputer operating
systems and evolved into a fully procedural programming language. Its latest version, RPG IV, is supported by IBM's leading minicomputer system, the AS/400. Historically, RPG has probably been the second most used programming language, after COBOL, for commercial applications on mid-range computers.

Similar to a "grenade" but worse. When you have a wing man he can "jump on the grenade". In other words, to distract the ugly best friend but an RPG is so ugly that the only thing a wing man can do is grab his bro and jump out of the way